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  • 1
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    AE-LEE measurements at low and mid latitude (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Shortly after the Low Energy Electron Experiment (LEE) on the Atmosphere Explorer-C was turned on following launch, an unexpected phenomenon was encountered at mid-latitudes, a counting rate was acquired with one maximum per roll. Recent analysis shows that these counting rates occur when the detectors are looking in the ram direction of the spacecraft and the spacecraft is near perigee, and are indeed not due to properly analyzed charged particles. After showing the probable cause of these counting rates, some upper limits to true fluxes at low altitudes in the energy range 200 eV to 25 keV from the LEE experiment are shown. OGO-4 data taken at mid-latitudes are included.
    Keywords: SPACE RADIATION
    Type: Proc. of the Workshop on Electron Contamination in X-ray Astronomy Expt.; 14 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Electron precipitation patterns and substorm morphology. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Statistical analysis of data from the auroral particles experiment aboard OGO 4, performed in a statistical framework interpretable in terms of magnetospheric substorm morphology, both spatial and temporal. Patterns of low-energy electron precipitation observed by polar satellites are examined as functions of substorm phase. The implications of the precipitation boundaries identifiable at the low-latitude edge of polar cusp electron precipitation and at the poleward edge of precipitation in the premidnight sector are discussed.
    Keywords: SPACE RADIATION
    Type: NSSDC-ID-67-073A-11-PM , Journal of Geophysical Research; 78; June 1
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    NASA TECHNICAL REPORTS
  • 3
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    Observations of interactions between interplanetary and geomagnetic fields (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Magnetospheric effects associated with variations of the north-south component of the interplanetary magnetic field are examined in light of recent recent experimental and theoretical results. Although the occurrence of magnetospheric substorms is statistically related to periods of southward interplanetary magnetic field, the details of the interaction are not understood. In particular, attempts to separate effects resulting directly from the interaction between the interplanetary and geomagnetic fields from those associated with substorms have produced conflicting results. The transfer of magnetic flux from the dayside to the nightside magnetosphere is evidenced by equatorward motion of the polar cusp and increases of the magnetic energy density in the lobes of the geomagnetic tail. The formation of a macroscopic X-type neutral line at tail distances less than 35 R sub E appears to be a substorm phenomenon.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70576 , X-646-73-390
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Coordinate transformations for studies of interactions between interplanetary and geomagnetic fields (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A graphical procedure is provided for performing coordinate transformations between the geocentric-solar-equatorial, geocentric-solar-ecliptic and geocentric-solar-magnetospheric coordinate systems. The procedure is designed to facilitate intercomparison of previous studies of interactions between interplanetary and geomagnetic fields that made use of these coordinate systems. The interaction in the geocentric-solar-magnetosphere system has been shown to give the most consistent results.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70684 , X-621-74-179
    Format: application/pdf
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  • 5
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    High-latitude proton precipitation and light ion density profiles during the magnetic storm initial phase. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements of precipitating protons and light ion densities by experiments on Ogo 4 indicate that widespread proton precipitation occurs in predawn hours during the magnetic storm initial phase from the latitude of the high-latitude ion trough, or plasmapause, up to latitudes greater than 75 deg. A softening of the proton spectrum is apparent as the plasmapause is approached. The separation of the low-latitude precipitation boundaries for 7.3-keV and 23.8-keV protons is less than about 1 deg, compared with a 3.6-deg separation that has been computed by using the formulas of Gendrin and Eather and Carovillano. Consideration of probable proton drift morphology leads to the conclusion that protons are injected in predawn hours, widespread precipitation occurring in the region outside the plasmapause. Protons less energetic than 7 keV drift eastward, whereas the more energetic protons drift westward, producing the observed dawn-dusk asymmetry for the lower-energy protons.
    Keywords: SPACE RADIATION
    Type: NSSDC-ID-67-073A-11-PM , NSSDC-ID-67-073A-16-OS , NSSDC-ID-67-073A-19-PM , NSSDC-ID-69-051A-05-OS , Journal of Geophysical Research; 78; Oct. 1
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  • 6
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    Precipitation of low-energy electrons at high latitudes - Effects of interplanetary magnetic field and dipole tilt angle. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE RADIATION
    Type: NSSDC-ID-67-073A-11-PM , Journal of Geophysical Research; 77; Dec. 1
    Format: text
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    NASA TECHNICAL REPORTS
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